A hucker is an extreme sportsman, usually bmx, who will take large drops and boost gaps. Usually huckers do not possess skill to grind, tailwhip, barspin, or any of that smooth boy stuff. Huckers also usually have little skill overall, and only impress by doing crazy drops and gaps.

Sean Burns, pre 2010
"Damn, did you see burns drop off that roof and snap his headtube?"
"Yeah what a fucking hucker"

Huckers or Huckies is an offensive word for the Horde faction in the Online game World of Warcraft. It is not recognised as a real insult. It comes from the word Horde (the character H), and the rest comes from the f-word